鸡胸腺交感传入神经元的定位及其纤维在脊髓内的分布──CB─HRP法研究

Location and the Central Projection of Primary Afferent Neuron of the Thymus in the Chicken A Study with CB HRP method

将ＣＢ一ＨＲＰ注入鸡一侧胸腺内，通过逆行和跨神经节追踪鸡胸腺交感传入神经元的定位及其纤维在脊髓内的分布，其结果如下：１．１３例双侧Ｃ２一Ｔ２脊神经节内出现标记细胞，Ｃ１，节，高峰位于Ｃ８节，标记细胞以小型细胞为主，细胞形态不一，多为圆形、椭圆形的假单极和双极神经元，散布分布于脊神经节内。２．在Ｃ６～Ｃ１３节颈髓的背角有标记的初级传入纤维和终末区。在背角内可见２～４个明显的标记终末区，在Ⅱ层和Ⅳ层的内侧有两个较大的标记终未区，在Ⅰ层和Ⅳ层的外侧亦有两个际记终末区。３．标记纤维和标记终未的密度与相应脊神经节内标记细胞的数量成正比，在Ｃ８～Ｃ１０．节段标记最稠密，向前向后标记纤维及终未逐渐稀疏，变淡。

CB一HRP was injected into the unilateral lobes of thymus in thechichen,the innervation of the thymus was examined with method of anterograde trans-ganglionic and retrograde transport horeseradish peroxidase(HRP).The results were asfollows:1.The labeled cells were found bilaterally in dorsal root ganglia(DRG)from C2 toC11.and the peak of the numbers were in C8,with ipsilateal being predominant 2.Labeled primary afferent fibers and terminal fields were observed bilaterallyin thegray matterof the cervical spinal cord,afetr labeled primary afferent fibers entered dor-solateral tract(LT).These fibers were split across the lateral collateral pathway(ICP)and the medial collateral pathway(MCP).The Lcp was densrer and thicker andcoursed.ventrally through laminas Ⅱ Ⅱ Ⅳ along the lateral edge of the dorsal horn andcontinued into lamina Ⅶ and overlaped the motorneurons of the dorsolateral of ventral horn in fhis region.Labeled afferent terminal fields were observed.mainly in the medialof lamina Ⅱ and Ⅳ,The results indicate that primary affeient fibers of the sympathetic neuren from thvmus terminated in lamina Ⅱ,Ⅳ and Ⅶ.